INVESTIGADORES
TOMBA MARTINEZ Analia Gladys
artículos
Título:
"Elongated mullite crystals obtained from high temperature transformation of sillimanite"
Autor/es:
A.G. TOMBA M.; M.A. CAMERUCCI; G. URRETAVIZCAYA; A.L.CAVALIERI; M.A. SAIZ; A. CABALLERO
Revista:
CERAMICS INTERNATIONAL
Editorial:
ELSEVIER SCI LTD
Referencias:
Lugar: Amsterdam; Año: 1999 vol. 25 p. 245 - 252
ISSN:
0272-8842
Resumen:
The high temperature transformation of sillimanite to mullite has been studied by means of dilatometry, X-ray diffraction, FT-IR and scanning electron microscopy (SEM-EDS) techniques. The results obtained showed that total transformation of sillimanite to mullite takes place between 1550 and 1600°C. A rapid nucleation occurs above 1550°C due to the resemblance of sillimanite and mullite structures. As a consequence of the high temperature of mullitization of sillimanite, the grain growth of elongated mullite crystals takes place almost simultaneously with the nucleation stage. Finally, a step of acid leaching was employed to remove theglassy phase and high-grade purity mullite powders were obtained.
